The SFC EMU v1.6 source code has been released and BassAceGold has made some unofficial changes to the emulator.

Changelog:

Added the ability to disable or enable audio
Added cpu speed 5 which is only slightly faster than cpu speed 4, but its there for people who may think it'll help
Attempted to reduce freezing of entering the emulator menu from in game (haven't tested to see if it works)

Installation Notes:

If you have a previous version of the emulator on your card, you just need to copy the .plg, If you are doing a fresh install then delete the NDSSFC.CFG file after copying everything over.


Download
Source- Supercard